直线y＝2x＋1关于y轴对称的直线方程为 A．y＝－2x＋1 B．y＝2x－1

孔金属化流程可以分为两大类：即去钻污和化学沉铜。

下列有关牙龈病变的叙述，错误的是（）

A.牙龈水肿见于慢性牙周炎

B.牙龈缘出血见于牙石或全身性疾病

C.牙龈挤压后有脓液溢出，见于牙龈瘘管

D.牙龈的游离缘出现黑褐色点线称铅线，为铅中毒的表现

E.砷中毒可在牙龈的游离缘出现类似的黑褐色点线状色素沉着

根据下面短文，并借助上下文和插图补充所缺信息。每个空只能填写一个形式正确、意义相符的单词。

Brian likes jogging(慢跑). He jogs in the park every morning.

He always takes five dollars  1 him. He always buys breakfast

for himself in the shop.

One day he jogged into the park and another jogger knocked into

him. A few minutes  2 , he found his five-dollar bill   3  in

his pocket. “The man might be a thief! He thought, “It must be him that took my money. I must fight against the crime(犯罪) ! ”

The man was only 30 meters ahead. Brian ran   4  him, hit him on the shoulder, and said “Give me the   5  !” The man was surprised, but at last he gave Brian a five-dollar bill. Then he ran away as fast as he   6  !

Brian felt really good and ran to the shop. He had got his money  7 . He bought himself a coffee and two hamburgers.

Then he ran back  8 .  His wife was waiting for him. She was shaking her head. “Oh, dear!” she said, “You’ ve had a   9  morning, haven’t you ?”

“No! Why? I’ve had a very good morning!” he said. “Really?” she said. “  10  you left your five-dollar bill on the table!”

在中国最早开展杂交水稻研究并取得重大成果、后来担任新中国首任农业科学院院长兼华南农学院院长的中大著名教授是谁？