完形填空

  It was very hot in the middle of summer and there were no trees 1the street. Mr. Read 2 his shop at half past five, and went 3 into the street and began walking to the bus stop. He was very 4. The sun shone straight down the street, and in a few minutes Mr. Read5very hot.

     A small boycame out of another6 in the street and 7Mr. Read. He stayed very8 him all the time, and he kicked Mr. Read's 9several times. Mr. Read looked at him 10 each time.

     After thefourth time, Mr. Read stopped, turned 11 and said to the small boy, "What are you doing? 12 following me like that! You're going to 13 my feet."

     "I'm 14, but don't stop me, please!" The small boy said, "It's very hot today, and there isn't 15shade anywhere else in the street."

“首先是西班牙和葡萄牙开创了全球化”这一论断阐释的依据是（    ）

下列关于同位素示踪实验的叙述，不正确的是

美国独立战争的转折点是____。