It is easy to see why AIDS seemed so mysterious and frightening when US medics first encountered it 35 years ago. The condition robbed young, healthy people of their strong immune system, leaving them weak and vulnerable. And it seemed to come out of nowhere.

Today we know much more how and why HIV – the virus that leads to AIDS – has become a global pandemic.

QUESTION: AIDS was first encountered (a)   years ago.

Opera refers to a dramatic art form, originating in Europe, in which the emotional content is conveyed to the audience as much through music, both vocal and instrumental, as it is through the lyrics. By contrast, in musical theater an actor's dramatic performance is primary, and the music plays a lesser role. The drama in opera is presented using the primary elements of theater such as scenery, costumes, and acting.

QUESTION: Opera originated from (a)   .

Dolphins are regarded as the friendliest creatures in the sea and stories of them helping drowning sailors have been common since Roman times. The more we learn about dolphins, the more we realize that their society is more complex than people previously imagined. They look after other dolphins when they are ill, care for pregnant mothers and protect the weakest in the community, as we do.

QUESTION: Dolphins are famous since the (a)   times.

There are two types of fats saturated and unsaturated. Unsaturated fats are an essential nutrient for cell growth and development. Unsaturated fats are mostly liquid at room temperature and are mostly found in plant products. Saturated fats have been linked to heart disease and other health problems. Saturated fats are mostly found in animal products and are solid at room temperature.

QUESTION : (a)   fats are mostly liquid at room temperature.

Carbohydrates account for the majority of nutrients in our diet. They are made of a series of Sugar molecules. The sugar molecules act as an efficient form of energy for the body. Carbohydrates are commonly found in breads, grains, vegetables, and various sugary foods. It is recommended that carbohydrates account for 60% of your daily calories. Meanwhile, fat is the densest energy source of the main nutrients. Fat provides just over twice the energy of carbohydrates per gram. Fat can be found in animal meat, butter, nuts, and oils. It is recommended that fats account for 20% of your daily calories.

QUESTION: 60% of (a)   is recommended daily.

The jaguar Is sometimes called Americans El Tigre by South and Central Americans. ----. Both names convey the awe and reverence this largest New World cat inspires. Their gold coat spangled with black rosettes was said to be the stars of night. In the Mayan religion, the sun took the form of a jaguar when traveling through the underworld at night.

QUESTION : One of the names of Jaguar is (a)   .

Monarch butterflies travel long distances to stay warm. They fly up to 3,000 miles to the same winter roosts, sometimes to the exact same trees. However, their life span is only a few months. ----. Their great-great-grandchildren return south the following fall.

QUESTION : The Monarch butterflies live only for a few (a)   .

The Moon goes around the Earth at an average distance of 400,000 kilometers (250,000 mi). It is locked to Earth, so that it always has the same half facing the Earth; the other half is called the "dark side of the Moon". It takes about 27⅓ days for the Moon to go all the way around the Earth but, because the Earth is moving around the Sun at the same time, it takes about 29½ days for the Moon to go from dark to bright to dark again. This is where the word "month" came from, even though most months now have 30 or 31 days.

QUESTION : The Moon goes around the Earth at an average distance of (a)   kilometers.

Eating insects is not a new phenomenon. In fact, insects and other such creatures are already eaten in 80 per cent of the world’s countries, prepared in customary dishes ranging from deep-fried tarantula in Cambodia to bowls of baby bees in China. With the specialist knowledge that Western companies and organisations can bring to the table, however, these hand-prepared delicacies have the potential to be produced on a scale large enough to lower costs and open up mass markets.

QUESTION : Insects and other such creatures are already eaten in (a)   of the world’s countries.