最难治的弱视是（） A.斜视性弱视 B.屈光参差性弱视 C.形觉剥夺性弱视 D.屈光

句型转换。

1. He gets home at five in the afternoon. (就划线部分提问) 

   _____ _____ _____ he _____ home in the afternoon?

2. I think Tom is at home. (否定句)

    I _____ think Tom _____ at home.

3. I want to know about his morning.(改为一般疑问句)

    _____ you _____ to know about his morning ?

4. What's the time? (改为同义句)

    _____ _____ is it?

5. Jack's family has one shower. (就划线部分提问)

    _____ _____ _____ does Jack's family _____?

即位于南半球，又兼跨东西两个半球的大洲是

A 大洋洲    B 南美洲    C 非洲    D 南极洲

叉丝单囊壳属

有学者指出：“经济重心的南移是我国历史发展的一个重大事件，也是迄今经济地理格局唯一的一次巨大变迁。”人们普遍认为我国经济重心南移完成于（）

A.三国时期

B.隋唐时期

C.两宋时期

D.明清时期

A VESSEL，OTHER THAN A RESCUE UNIT，DESIGNATED TO CO-ORDINATE SURFACE SEARCH AND RESCUE OPERATION WITHIN A SPECIFIED AREA is known as（）.

A.salving vessel

B.Co-ordinator surface search

C.MERSAR

D.the vessel being salved