X线管阳极焦点面损坏的原因不包括（） A.超负荷使用。由于一次性过载或累积性过载，使

二氧化碳的固体俗称______，可用于______和______．引起温室效应的气体有______、______、______、______，防治温室效应的措施有______，______，______．

Mrs.Smith finds it hard to clear up the mess, as her children are always ________ whenever she tries to.

A．in the way

B．on watch

C．in sight

D．on the line

用所给词的适当形式或按要求填空。

1. I'm afraid I have _______ (not) time to play with you.

2. He'd like a hamburger and some ________ (fish).

3. Would you like something _______ (drink)?

4. Help ________ (yourself) to some coffee, kids.

5. I can two _______ (woman ) under that big tree.

所得税是以纳税人的净利润为征收对象，以经过计算得出的应纳税所得额为计税依据。

下图是某家族系谱图，甲种遗传病（基因为A、a）乙种遗传病（基因为D、d），回答下列有关遗传的问题。

甲病属于（）遗传病