4. A 解析:词义猜测题。最后一段的最后一句说,观看3D演示的学生对科学的兴趣普遍提高,因此该词是指“专注的”。因此选A。
B
My family and I decided to try to help the less fortunate at Easter. It was last March and my brother, sister and I stayed home after yet another snowstorm. We dressed warmly and ran out of the house to collect money and canned goods.
Some people slammed their doors in our faces and others told us they already donated at their churches. We still continued, though. To our surprise,
the people who we expected to be the most generous weren't. The “welltodo” gave little or nothing at all, while the poorest gave everything they could afford. In the first couple of hours, we raised $60 and during the following three days of going door to door, we collected about
$1,000.
We then went to the grocery store and bought rice, potatoes, macaroni(通心粉) and juice. Afterwards we arranged the food and put it into 25 colored laundry baskets, each also containing a threepound ham.
Finally, right before the holiday, my family and I made the deliveries(递送). As the people opened their doors and saw what we had brought, they were very happy. Big smiles on the oncesad faces were symbolic of how happy they truly were. Most of them replied, “Now we can have an Easter dinner.”
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