Look _ the trees. They are tall.[ ]
A. on
B. for
C. at
答案：C
Nowadays advertisements are everywhere. I think advertisements have both good and bad effects 小题1: young students.
On one hand, advertisements give us information about things 小题2: buy. They make 小题3: easier for us to choose the best product. Also, some advertisements are beautifully designed and pleasant to look at. 小题4: on the other hand, they can make trouble for us. First, most advertisements look attractive and they persuade us to buy things we don’t need at all. This is especially bad for young people. They are not making money yet. So they have to ask for money 小题5: their parents. Sometimes they buy lots of junk food 小题6: the advertisements look delicious. This is not healthy for them. What’s more, some advertisements don’t tell the truth. Many people find 小题7: cheated after using certain products.
In short, advertisements have pros and cons﹙赞成和反对点﹚. 小题8: young students, we should learn to deal with.
发性骨髓瘤的临床症状有（）
A.贫血
B.容易骨折
C.血片上有缗钱状红细胞
D.血沉加快
E.骨髓片上见到骨髓瘤细胞
