胎盘产生的胎盘生乳素，正确的是A．随妊娠的进展及胎盘增大，其分泌量逐渐减少B．是合体

根据抗原抗体反应的特点，以下哪种说法不正确的有()

A．抗原抗体结合牢固不易受环境影响

B．解离后的抗体结构与活性改变

C．解离后抗体的活性和特异性不变

D．抗体与抗原结合后仍可与其它抗原结合

E．在同一反应体系中，沉淀反应最适比恒定不变

在稀H₂SO₄和CuSO₄的混合溶液中，加入适量铁粉，使其正好完全反应，反应后经过过滤得到固体物质的质量与所加铁粉的质量相等，则混合溶液中H₂SO₄与CuSO₄的质量比为      。 

我国“协航”号轮与甲国“瑟皇”号轮在乙国领海发生碰撞。“协航”号轮返回中国后，“瑟皇”号轮的所有人在我国法院对“协航”号轮所属的船公司提起侵权损害赔偿之诉。在庭审过程中，双方均依据乙国法律提出请求或进行抗辩。根据这一事实，下列哪一选项是正确的

A．因双方均依据乙国法律提出请求或进行抗辩，故应由当事人负责证明乙国法律，法院无须查明
B．法院应依职权查明乙国法律，双方当事人无须证明
C．法院应依职权查明乙国法律，也可要求当事人证明乙国法律的内容
D．应由双方当事人负责证明乙国法律，在其无法证明时，才由法院依职权查明

In China, people usually set off firecrackers to celebrate Spring Festival. But this year seemed very quiet. It was really different. A man called Zhang Wei was asked by a reporter in an interview. He said that his friends and he hadn’t set off a single firecracker.

“We all suffered from last month’s smog(雾霾). If we don’t call an end to the firecracker, the environment will get worse and worse during the holiday.” Said Zhang Wei. He put up a notice in his community in Jinan, the capital of Shandong Province. In the notice, he called on more people to set off fewer firecrackers during this year’s Spring Festival holiday.

Lots of parents agreed with Zhang Wei’s idea. They said that they hated the noise of firecrackers. The noise used to wake up their babies too early. The babies really needed quiet mornings,

More Chinese looked forward to celebrating the holiday in a greener way. They decided not to set off firecrackers. They also decided not to waste food. They said that the new celebrations sounded fashionable.

“My family didn’t buy any fireworks this year. Instead, we donated the money to charity. It’s good for the environment and charity as well.” Internet user “Fighter” wrote on Sina Weibo.

小题1:How do people usually celebrate Spring Festival in China?

A．By setting off firecrackers.

B．By donating the money to charity.

C．By not wasting food.

D．By putting up a notice.小题2:Lots of parents hated the noise of firecrackers because____.

A．they couldn’t afford to buy them.

B．firecrackers were too expensive.

C．the noise might wake up their babies.

D．firecrackers might cause fire小题3:More people decided _____.

A．not to get together

B．not to set off firecrackers

C．not to throw away more food

D．to call an end to all the celebrations小题4:What’s the best title for the passage?

A．Don’t Waste Food

B．Spring Festival Celebrations

C．Spring Festival Goes Green

D．Firecrackers and Noise

下列特殊土遇水后强度最高、压缩性最小的是( )。

A．淤泥及淤泥质土
B．湿陷性黄土
C．红黏土
D．膨胀土