在制作临时装片，在盖上盖玻片时，要将盖玻片的一端先接触液滴，然后再缓缓盖下。这样操作的目的在于（ ）
A．防止盖玻片破损
B．防止将标本压坏
C．防止液滴飞溅
D．防止在盖玻片下形成过多气泡
答案：D
题目分析：在盖盖玻片时正确的步骤是将盖玻片的一边先接触水滴，然后才轻轻地盖上，这样盖玻片下面的液体就会慢慢的把空气赶走，就可避免气泡的产生，故选D。
| Choose the different pronunciation of the underlined letters. 选择单词中画线字母发音不同的一个。 |
| ( ) 1. A. that ( ) 2. A. game ( ) 3. A. five ( ) 4. A. dog ( ) 5. A. fun ( ) 6. A. team ( ) 7. A. strong ( ) 8. A. play ( ) 9. A. school ( ) l0. A. works | B. hand B. yell B. bike B. pop B. put B. breakfast B. think B. say B. check B. brushes | C. hat C. some C. his C. hot C. Sunday C. ready C. want C. says C. chart C. washes | D. make D. have D. exercise D. other D. brush D. weather D. drink D. pay D. lunch D. watches |