细胞内钾约占总钾量的98%，血浆中仅占（） A.1.5% B.0.3% C.0.2%

党的十一届三中全会以后，我们党深刻总结社会主义建设正反两方面的经验，在正确判断国情的基础上，形成了（）的基本路线，开辟了中国特色社会主义道路。

A.以经济建设为中心、坚持经济增长原则、坚持独立自主的“一个中心、两个基本点”

B.以经济建设为中心、坚持四项基本原则、坚持独立自主的“一个中心、两个基本点”

C.以精神文明为中心、坚持四项基本原则、坚持改革开放的“一个中心、两个基本点”

D.以经济建设为中心、坚持四项基本原则、坚持改革开放的“一个中心、两个基本点”

决定膀胱癌患者预后的因素是______

A．肿瘤的生长部位
B．血尿的程度
C．肿瘤浸润的深度和细胞的分化程度
D．肿瘤的大小
E．肿瘤的数目

植物的茎具有向光性的原因是（）

A.向光一侧长得快

B.背光一侧生长素多

C.向光一侧生长素分布多

D.背光一侧没有生长素

It’s all annual back-to-school routine. One morning you wave goodbye, and that (1) evening you’re burning the late-night oil in sympathy. In the race to improve educational standards, (2) are throwing the books at kids. (3) elementary school students are complaining of homework (4) What’s a well-meaning parent to do.As hard as (5) may he, sit back and chill, experts advise. Though you’ve got to get them to do it, (6) helping too much, or even examining (7) too carefully, you may keep them (8) doing it by themselves. "I wouldn’t advise a parent to check every (9) assignment," says psychologist John Rosemond, author of Ending the Tough Homework. "There’s a (10) of appreciation for trial and error. Let your children (11) the grade they deserve. " Many experts believe parents should gently look over the work of younger children and ask them to rethink their (12) . But "you don’t want them to feel it has to be (13) ," she says.

That’s not to say parents should (14) homework-first, they should monitor how much homework their kids (15) . Thirty minutes a day in the early elementary years and an hour in (16) four, five, and six is standard, says Rosemond. For junior-high students it should be " (17) more than an hour and a half," and two for high school students. If your child (18) has more homework than this, you may want to check (19) other parents and then talk to the teacher about (20) assignments.

19（）

A.with

B.in

C.out

D.up

二氧化碳灭火器的适用范围：它适用于扑救（）、（）、（）等忌水物质的火灾。