河北省入海河流一共有（）条。 A.52 B.63 C.71 D.83

下面加点字注音有误的一项是

A．“百行（xíng）业为先，万恶懒为首。”没职业的人简直是社会上的蛀（zhù）米虫。

B．大自然沉浸( jìn)在梦乡。明月撒（sǎ）下它的光辉，给周围的一切披上银装。

C．每一首都是一群颤（chàn）抖的星星，像冰雪覆（fù）盖在心头。

D．当田圃（bǔ）冷冻了一冬禁锢（gù）着种子，牧场枯黄失去了牛羊的踪迹。

用所给单词的适当形式填空。

1. Let's _____ (phone) Kate.

2. Mr Li often encourages me _____ (work) hard.

3. I would love _____ (speak) English with you.

4. Please speak _____ (slowly), I can't follow you.

5. It's hard _____ (learn) English well.

6. The children are playing on the playground _____ (happy).

7. I must buy a new pen, because my pen is_____ (miss).

8. They are all by _____ (oneself) today.

9. The old woman looked very _____ (worry).

10. Which island is _____ (far), the first one, the second one or the third one?

测定大理石含CaCO₃的质量分数，取大理石样品12.5g，加入盛有100g稀盐酸的烧杯中，两者恰好完全反应（假设其他杂质不与盐酸反应，也不溶解）．烧杯内物质的质量变为108.1g．试计算大理石样品中CaCO₃的质量分数．

Have you ever felt your cheeks get hot，your palms sweaty or been afraid to _______your teachers’ eyes when they are about to call on someone?[ ]

A．take on

B．look into

C．occur to

D．look at

从事实验动物繁育和商业性经营的单位，取得生产许可证，必须具备哪些基本条件？